Newsom’s daughter has arrived

Baby Girl Newsom is unlike her often-late father. She’s not due ’til Thursday, but Mayor Gavin Newsom just tweeted, “Arrived at hospital — hours away from becoming a father.”

The Newsoms have picked a name for their first baby – a girl – but the mayor wouldn’t reveal their choice Thursday.

We’ll keep you posted as we receive tweets or any other information.

UPDATE: Another mayoral tweet from the hospital: “OK…I’m nervous — 10 minutes and we begin.”

UPDATE: She’s here! Montana Tessa Newsom was born at 12:39 p.m. and is 20.5 inches long and 7 pounds, 12 ounces. Montana is where Newsom married his wife, Jennifer Siebel Newsom. (Her family has a home there.) And Tessa is the name of Newsom’s late mother. Congratulations!

We hope to have a photo for you later today.

UPDATE: New daddy tweeting again. First, “Baby girl :)” and then “Jen doing great…Not sure she is happy I am on twitter.”